Yep it's been known to work:) usually a bit of fluff or hair carried in with the disk, great it worked for you. In extreme cases of lens contamination (provided the blue laser is not failing) a bluray lens cleaner with brushes usually resolves the issue. I was not a believer in these devices for a long time but it resolved a specific issue on my 05 with one specific disc but I only ever use it if it is really needed I would not recommend regular use. I use only a good quality one from Maxell with brushes and have only needed to use it once on the 05 so far. Regards compressed air, it is a good idea too to blow off the suspect disc make sure not to get to close and do a squirt away from the disc first to remove any residue or liquid gas before blowing off the disc to remove any really small particles.